Liquid cooled flexible brake band



April 2, 1935 J. J. DURST 1,996,194

I LIQUID COOLED FLEXIBLE BRAKE BAND Filed July 23, 1951 2 Sheets-Sheet 1 April 2, 193 5. J. .JpDURST LIQUID COOLED FLEXIBLE BRAKE BAND Filed July 23, 1951 2 Sheets-Sheet 2 which, thacabkwinding drum of well tool rais- 15 mentioned 'through which a, cooling fluid, such Patented Apr. 2, 1935 Th s; nventi n. i latesrbroadly to brake bands,

he primaryyobiectcfy this invention is to provide,- brake? band; especially: but, not necesaiieptedpfpr usawitn-the-brakeorum with ing lowering; mechanism are usually Q uinn i A still further object of thezinllentionis to providea, brake hand, of the; characterabove men- 1g]: tionedwhichcan also-be used onthe-calfwheels rmi bullwheelslof well, drilling mechanisms, or bo l ng: and-1 null nemechani s A still/further; object ofthe invention is to provide a, brake, bandof the; character above 4,5 water maybe-passed, thus improving over the old; method of cooling, brake, drums, and bands, which onsisted either in pouring water over the brakadrum anddts-band or in injecting a cool- 2o, ing,liguid directly.- into. the drum, .wheel or acter I comprises a plurality of similar sections flange-.1 r

A still further objeot of, the, invention is to provide a, flexible brakeband through which heremay, e a. c ntinu us flow; of Water,. for

, cooling purposes.

Other objects; and advantages of the invention will become apparent from a study of the following description, taken in connection with the accompanying drawings wherein:

Figure 1 is a front elevational view of a well drilling cable drum, the brake flange or Wheel of which is equipped with my improved brake band. 7 I

Figure 2 is an end elevational view thereof.

Figure 3 is a longitudinal sectional view taken substantially on the line 3-3 of Figure 2.

Figure 4 is a transverse sectional view taken substantially on the line 44 of Figure 3. V

Figure 5 is a plan view of a portion of the brake band. I f

Figure 6 is an end elevational view of alink or section of the brake band.

Figure 7 is a fragmentary elevational view of a slightly modified form of brake band.

With reference more in detail to the draw,- ings, it will be seen that my improved brake band designated generally by the reference charor links II each of which, is in the present instance and preferably, of substantially rectangular shell like construction in cross section and is provided with a fluid circulating chamber I2 within which is arranged a substantially U-v shaped bafile I3 connecting the top and bottom walls of the chamber I2 and spaced from the side and end walls of the chamberas shownin Figures 3and4. Eachsection or link II at oneendisprovided:

' with a longitudinal notch or. recess I4 and at its opposite end with a longitudinally projecting lug orprojection' I5; r c

The links or sections I I are pivotally connected together, by arrangingthe projections I5 inthe: recesses 14, and passing pivot bolts I5 through thelinks or sections I Itransverse of the notches: I l and through transverse openingsextending through theprojections I5v (seeFigureB).

Each link or section I I, has its recess connected: to the chamber I2 through the medium of an opening I 1, and these, openings I 'I.- serve in con-r junction with longitudinal boresor openings-Hi2 provided in the projections I55, to connect-the:

chambers I2 wherebyis provided-a fluid-circulating passage through thebrake drum fromzone; endto the other thereof. In this-connection it. will be noted, from astudy of-Figure 3-; that the- U-shaped baffies I3 have theinopen sides con-i fronting theapertures I-I. so that the water, orother cooling fluidpassing from onechamber I2, to another, uponenteringthe chamber 'I2 .w-ill bev directed between opposite sides of; the battle. III c and will flow outwardly from between said sides of the baffie to circulate in the chamber I2 about the bafile, finally passing out of the chamber I2 through the passage or bore I8 communicating therewith and provided in the lug or extension I5.

In actual practice, any one of the link sections I! may be provided in the top thereof with an in,- let nipple or like connection serving to couple one end of a hose I'I leading from a suitable source of supply while another of said links or sections II preferably adjacent the movable end of the band will be provided with like meansfor coupling an outlet hose I8 thereto, which hose I8 may return to the source of supply.

As shown in Figure 2, the hose I! may be conpled'to a link or section I I arranged intermediate the ends of the brake band in which instance, each end linkor section I I may be equipped with a hose I8.

In the present instance, I have shown the brake band as applied to the brake wheel or flange of the cable drum of a well drilling mechanism, the drum being herein designated generally by' the reference character D and provided at each end thereof with a circular flange or brake Wheel D about which is disposed the brake band I0. As

' shown in Figure 2 one end of the band is suitably connectedto an operating lever L, while the other end of the band is anchored to the platform P through the medium of the usual anchoring bolt B, or may be connected directly to the mechanism. As shown in Figures 1 and 2, the brake band is suspended from a suitable part of the well drilling mechanism through the medium of resilient suspension devices each of which includes a. pair of links secured to a fixed part of the mechanism, a second pair of links suitably engaged with the band, and coil springs connecting the links; the suspension means providing an eflicient resilient hanger for the band when the same is in open or inoperative position.

With a brake band of this character, it will be seen that water may flow through the band from one end to the other, the bafiles l3 serving to retard or slow the flow of water increasing the cooling efiect of the water, so that each link or section of the band will be maintained in a relatively cool state, and the overheating of either the drum or band thus entirely prevented.

Obviously such means of cooling the band and drum overcomes the difficulties and objections to former methods which consisted in either pouring water over the brake band and the brake drum thereby attempting to wet and cool a fast moving wheel, winding drum so forth, etc., which results in causing the brake band to slip, or secondly to build wings into the side of the brake drum in an attempt to cool the braking device the heating of which is of course caused by the rubbing together of the'brake band and the brake drum or wheel, or thirdly by introducing a cooling liquid directly into the drum, wheel or flange.

In Figure 7, I have shown a slightly modified form of the invention wherein it will be seen that the links or sections I I are each secured at one side in any suitable manner to one side of a flexible band IS, the pivot bolt l6 being dispensed with, the one piece band I 9 serving to receive the strain. However it is to be understood of course that the link sections l I will have their lugs or extensions 15 received in the notches or recesses 14 so as to provide a continuous fluid circulating passage from one end to the other of the brake drum. Fluid will be introduced and discharged from the flexible brake drum in this 7 claim as new is:

form of the invention in substantially the same manner as that described with respect to the form of the invention shown in Figures 1 to 6 inclusive.

Even though I have herein shown and described the preferred embodiment of the invention, it is to be understood that the same is susceptible of further changes, modifications and improvements coming within the scope of the appended claims.

Having thus described myinvention, what I 1. A brake band comprising a plurality of pivotally connected sections, each of which is provided with a recess at one end thereof and a lug projecting therefrom at the opposite end thereof, each of said sections being provided with a water chamber having an inlet adjacent said recess, and an outlet passage extending through said lug.

2. A brake band comprising a plurality of pivotally connected sections, each of which is provided with a recess at one end thereof and a lug projecting therefrom at the opposite end thereof, each of said sections being provided with a water chamber having an inlet adjacent said recess, and an outlet passage extending through said lug, and a substantially U-shaped bafile arranged in said water chamber. 1

3. A brake band comprising a flexible band and a plurality of shell like sections secured thereto, and provided at one end with a recess and at its relatively opposite end with a projection for reception in a recess of an adjacent section.

4. A brake band comprising in combination a plurality of individual water chambers, relatively short passages connecting the chambers and a battle arranged in each chamber in operative position to a passage between adjacent chambers.

5. A brake band comprising a plurality of pivotally connected sections each of which is provided with a water chamber, and means forming passages pivotally connecting said sections where- 'byprovision is made for a circulation of water through the brake band from end to end thereof.

JOHN J. DURST. 

